Not what you're looking for? See my earlier post about Fixing Windows 10 after upgrading from Windows 7 or 8.
The saga of the incompatibility between Windows 10 and Cisco VPN Client v5.x continues on. After a rather pushy Windows Update, I reluctantly took the update and discovered that Windows was actually doing an upgrade to Version 1511, which took a while to complete. After waiting ages for it to install, I signed in and got a nasty little popup message that my Cisco VPN Client had been removed because it wasn't compatible (!!!!!). Game on.
TL;DR: Thanks to a Reddit thread on this issue, I was able to quickly find the final step to get everything working again.
Thanks to Reddit user AlphetaCS! I modified these steps slightly. Here's the original post.
- Download the vpnclient-winx64-msi-5.0.07.0290-k9.exe (not sure about x32 systems). This can be found online if you don't have it. One place that worked for me was the last file on this page.
- Use 7-Zip to extract the EXE file (we're going to need the vpnclient_setup.msi from the extracted files)
- Go to the Control Panel | Programs | Programs and Features, find the Cisco Systems VPN Client 5.0 in the list of programs, and use the repair option.
- The repair will ask you for an MSI source, point it to the extracted vpnclient_setup.msi in Step 2.
- At this point, if you try to connect you'll get a "Failed to Enable Virtual Adapter" error. This is where I left off, unsure of what to try next.
- To fix it, go to the Registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA and change the DisplayName value to "Cisco Systems VPN Adapter for 64-bit Windows" without quotes -- this entry typically has some crud before the display name that interferes with the driver.